Boiler



(No Model.)

D. BEST. BOILER.

2 Sheets-Sheet 1.

Patented Sept. 23, 1:890,

{No Model.) 2 SheetsSheet 2'.

D. BEST. BOILER.

No. 436,933. Patented Sept. 23, 1890.

UNITED STATES PATENT OFFICE.

DANIEL BEST, OF SAN LEANDRO, CALIFORNIA.

BOILER.

SPECIFICATION forming part of Letters Patent No. 436,933, datedSeptember 23, 1890.

Application filed April 29, 1890.

To all whom it may concern.-

Be it known that I, DANIEL Bnsr, a citizen of the United States,residing at San Leandro, Alameda county, State of Oalifornia,haveinvented an Improvement in Boilers; and I hereby declare the followingto be a full, clear, and exact description of the same.

My invention relates to certain improvements in steam-boilers, and it isespecially adapted for that class of boilers, which are known asportable boilers, being mounted upon wheels and employed in connectionwith traction and field engines.

It consists in certain details of construction, which will be more fullyexplained by reference to the accompanying drawings, in which- Figure 1is a vertical section taken through the boiler and furnace. Fig. 2 is avertical section taken transversely through the furnace portion. Fig. 3is an exterior view showing the arrangement of the feed-doors.

A is the vertical cylindrical shell of my boiler having heads at top andbottom, and fines B passing vertically through these heads and forming apassage from the chamber below the boiler to the space above, whichconnects with the smoke-stack or chimney.

From the lower portion of the cylindrical boiler-shell A the furnace Dextends to one side to a sufficient distance to provide suchfurnace-space as may be necessary. The furnace is surrounded on top andsides by the usual water-space E, and the outer and inner shells areconnected together by staybolts, by which they are properly braced.

A chamber F extends from the furnace horizontally beneath thecylindrical portion A and the tubes B of the boiler, and the bot tom ofthis cylindrical portion and the space between it and the bottom of thefurnace D is lined with fire-bricks or other suitable fireresistingmaterial, as shown at G,which form a low back to the furnace; but thetop is level with the bottom of the chamber F. This lining also preventsso great a heat at the bottom of this portion of the boiler as wouldcreate a danger of fire in grain or stubble fields. That portion whichis beneath the grates is protected by a water-pamas shown.

H is the ordinary horizontal grate fixed Serial No. 349,949. (No model.)

within the furnace D, and I are vertical grates journaled so as to swingupon hinges (shown at J) at the sides of the space which they occupy,and they are arranged to latch upon suitable catches K at the centralportion where they meet. These vertical grates extend across the rear ofthe furnace proper and between it and the chamber F beneath the boilerand the vertical flues. This space F forms what I term a settler, intowhich the ashes and debris from the combustion of the light fuel in thefurnace are allowedto settle, so as to prevent them from passing upthrough the fines to be discharged through the chimney. The verticalgrates I act to catch and detain the light straw fuel and prevent itsbeing swept into this chamber, and only the burnt cinders from the strawwill pass through and over the grates.

\Vhcnever it is desired to clear out the space F, it is done by simplyunlatching the vertical grates I by means of a rod or hook and swingingthem back against the sides of the furnace, when all the deposit can beraked out from the space F and the grates closed together again.

This boiler is especially adapted for the purpose of burning straw as afuel, and in order to provide for a perfect combustion of the straw Ihave shown two feed-tubes L, which are fixed to doors opening into eachside of the front of the furnace.

In burning straw as a fuel the straw is ignited as soon as it enters thedoors and burns from the surface like the wick of a lamp, instead ofburning like other fuel from the bottom of the grates upward. Thereforeby using the two feed-doors I am enabled to supply a larger surface forcombustion and to insure the straw being burned more rapidly andperfectly than if I usedbut one door. The light straw and cinderstherefrom are carried back through the furnace until they strike theintercepting vertical grates I,which prevent the straw from beingcarried back directly into the chamber F, and insures its nearlycomplete combustion before it reaches that chamber. The result of thisis that nearly the whole of the heat is extracted from the burning strawbefore it reaches that point,

and only the cinders and dbris of the straw will fall into this chamber,and they will thus be prevented from passing out through the flues B, asbefore described.

Beneath the furnace D is a water-pan M, which extends out in front ofthe furnace, and all ashes and cinders which fall through the grates IIwill fall into this pan, and the material which is raked out from timeto time from the furnace will fall into the front portion of thisWater-pan, where it will be extinguished. In order to control the draftthrough this water-pan, I have shown a grate or door N, hinged so as tofall down across the pan and prevent a draft of air at this point.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, isy 1. In a boiler having a vertical shell,With tubes passing vertically through the same and communicating with achamber beneath, a furnace situated at one side and opening directlyinto said chamber, verticallyarranged pivoted grates extendingtransversely across said chamber at or near its junction with the backof the furnace, and means for holding the grate in position,substantially as herein described.

2. In a boiler, a vertical tubular shell hav ing the furnace orextension atone side of the lower part and a chamber in line with saidfurnace and beneath the boiler and its fines, in combination with thevertical grates hinged to the sides within the furnace and capable ofswinging outward against the sides of the furnace and a central catch bywhich these grates are latched and held in position trans versely acrossthe space between the furnace and the chamber beneath the boiler,substantially as herein described.

3. In a boiler, the vertical cylindrical shell having the interiorvertical fines, a chamber beneath said flues, a furnace extending to oneside of the boiler in line with said cham-.

ber and having the two door-openings. provided with the straw-feedingfunnels, and the vertical swinging grates hinged between the furnace andthe rear chamber, substantially as herein described.

In witness whereof I have hereunto set my hand.

DANIEL BEST.

Witnesses:

WILLIAM W. REID, GEO. S. SooTr.

